mirror of
https://github.com/ptitSeb/box86.git
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48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#include <string.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <math.h>
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#if defined(__x86_64__)
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#error Nope!
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#else
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__attribute__((naked)) uint64_t _idiv_(uint32_t a, uint32_t b)
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{
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asm volatile (
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"xor %%eax, %%eax\n"
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"mov 4(%%esp), %%edx\n"
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"mov 8(%%esp), %%ecx\n"
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"shrd $0x10, %%edx, %%eax\n"
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"sar $0x10, %%edx\n"
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"idiv %%ecx\n"
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"ret"
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:::);
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}
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#endif
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int main(int argc, const char** argv)
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{
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uint32_t tests[][2] = {
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{0x000002d0, 0x00000500},
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{0xfffffa5d, 0x000186a0},
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{0x00001701, 0x000186a0},
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{0xffff9a19, 0x000186a0},
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{0xffffe7f3, 0x000186a0},
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{0x00015840, 0x000186a0},
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{0xff451330, 0x000186a0},
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{0xffff626a, 0x000186a0},
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{0x00009120, 0x000186a0},
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};
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int n = sizeof(tests)/sizeof(tests[0]);
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uint64_t res;
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for(int i=0; i<n; ++i) {
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printf("SDHLD/SAR/IDIV 0x%x 0x%x ", tests[i][0], tests[i][1]);
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res = _idiv_(tests[i][0], tests[i][1]);
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uint32_t divi = res & 0xffffffffLL;
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uint32_t modo = res >> 32;
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printf("=> 0x%x / 0x%x (%lld/%d => %d + %d)\n", modo, divi, ((int64_t)tests[i][0])<<16, tests[i][1], divi, modo);
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}
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printf("\nDone\n");
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}
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